Machine for engraving or sinking dies.



No. 690,026. Patented nee. 3|, 19m J. F. KELLER.

MACHINE FOR ENGRAVING 0R SINKUNG DIES.

(Application filed Aug. 8, 1901.)

3 Sheets-Sheet L (No Model.)

lllllllllllllllll llirlll w/rlvEsses NVENTOH 9 QuaL B) s 6 191? ATTORNEY in: "cams PETERS w mom-mun" WASHINGTON p. c.

Patented 00. 3|, I90l.

J. F. KELLER.

MACHINE FOB ENGRAVING 0R SINKING DIES.

(Application filed Aug. 8, 1901.)

3 Sheets-Sheet 2.

(No Model.)

f7 .99 "E g lNVENTUl'? I IVE-"SIS: WK

m: mamas Pm ENS cufimovo-umm vusmuc'mu, o. c.

No. 690,026. Patented Dec. 3!, l90l; J. F. KELLER.

MACHINE FOR ENGRAVING 0R SINKING DIES.

(Application filed Aug. 8, 1901.)

s sham-sheet s.

(No Model.)

INVENTOH mk ATTORNEY WHJLJQ to a shaft and engaging with said wheels.

U MED STATES PATENT OFFICE.

JOSEPH FINK KELLER, OF NEvV YORK, N. Y., ASSIGNOR TO SYDNEY A. KELLER, OF NEW YORK, N. Y.

MACHINE FOR ENGRAVING OR SINKING DIES.

SPECIFICATION forming part of Letters Patent No. 690,026, dated December 31, 1901.

Application filed August 8, 1901. Serial No. 71,316. (No model.)

to machines for engraving or sinking dies, and

more particularly upon machines constructed like that shown and described in Letters Patent No. 500,317, granted to L. F. Oampi June 27, 1893. As many of such machines are in 5 daily use and are well known and understood by those skilled in the art,no description there of is here necessary further than to point out thatin such machines, and mounted in brackets upon the bed thereof, are two parallel 2o spindles capable of adjustment toward or away from each other and rotating slowly in "the same or opposite directions, motion being imparted thereto by means of worm-wheels fixed thereon and driven by worms secured On the end of one of these spindles is mounted a templet, pattern, or model which it is desired to copy, and on the corresponding end of the other spindle is mounted a piece of material to be engraved or sunk in imitation of the aforesaid model or pattern. Opposite the pat-tern and piece of material to be operated upon is placed a bar or arm, one end of which is furnished with a kind of universal joint 5 in order that said bar or arm may be freely moved in vertical and horizontal planes. On this bar or arm are secured, first, a pointer or tracer, the end of which is kept in contact with the surface of the model as it revolves o slowly in front of it, and, secondly, a revolvcorrespondingly upon the material under operation. It has been found from experience that much valuable time is lost in the operation of machines constructed and arranged in this manner by reason of the fact that both the model and the material under operation are given a complete rotation, the pointer or line 2 2 of Fig. 1.

tracer being thereby caused to travel over plain surfaces as well as over the figured surface of the model, the operation of the cutting-tool of course corresponding to that of the pointer or tracer.

The object of my invention is to so construct and arrange the machine that the pointer or tracer will be constantly retained in contact with the figured surface only of the model, the cutting-tool in consequence being kept continually engaged in its cutting operations, thereby saving that time which has heretofore been lost by reason of the several tools traveling over plain surfaces. With this object in view I have so constructed and arranged the several parts that the model or pattern and also the material under operation are given but a partial rotation, so that the pointer or tracer will travel over the figured surface of the model from one side or boundary thereof to the other, whereupon the direction of travel or rotation of said model will be automatically changed, the effect being that the model is caused to oscillate rather than rotate, the movement thereof in either direction being sufficient to cause the tracer to travel across the figured surface only.

In the accompanying drawings, Figure l is a top plan view of a part of a machine having my improvements applied thereto. Fig. 2 is a sectional view of the same, taken on the Fig. 3 is a side view of the belt-shifting mechanism, and Fig. at is a sectional view of the device for holdinglhe beltshifter in its different positions.

On the bed 2 of the machine are mounted the spindles or shafts 64 65, adapted to revolve in bearings in the head-stocks 66 67, the latter being preferably held stationary, while the former may be adjusted on the table or bed 2 toward or away from the headstock 67 and secured to said bed by means of bolts passing through the slots 70 71 in said table. These spindles 64: G5 are placed parallel to each other, as shown, and at distances apart dependent upon the proportion that the size of the object to be engraved bears to that of the model from which it is to be copied. To these spindles 64 (35 are secured wormwheels 72 7 3, which engage with the worms 74 75, secured to the shaft 76, revolving in bearings 77 78, formed on or secured to the head-stocks 66 67, said shaft 76 also having secured thereto the speed-pulley 79, through which the motion is imparted thereto, an opening 80 being formed in the bed or table 2 for the'passa-ge of a belt 81 through the same and around said pulley 79.

On the end of the spindle 65 is secured a chuck 82, in which latter is mounted the model or pattern 6 which it is desired to copy, and on the end of the spindle 64 is secured the chuck 83, carrying the material 7 under operation and out of which the die is to be formed or engraved in imitationof themodel 6. Opposite the model 6 and material 7 are mounted, respectively, a tracer and cuttingtool; but as such are well understood by those skilled in the art and as such form no part of my invention no illustration or description thereof is necessary. It is also understood by those familiar with these machines thatin operation both the model 6 and material 7, with their respective spindles, are given a complete rotation and this by reason of the fact that the shaft 76 is rotated in but one direction, thereby causing the loss of time before referred to. To overcome this objection, I secure to the shaft or spindle 65 and to the end opposite that carrying the model 6 a disk 84, provided with a recess 85 and with the groove 86, dovetailed in cross-section, asillustrated in Fig. 2, in which groove are adjustably secured the tripping-arms 87 88.

On the main driving-shaft 89, mounted in the frame of the machine, is secured a pulley 90, around which pass the straight belt 91 and the crossed belt92, said belts 91 92 passing around pulleys secured to the shaft 93, supported in the frame of the machine, as hereinafter explained. On this shaft 93 are mounted the pulleys 9st 95 96, the central pulley 95 being a tight one and the pulleys 94 96 loose to revolve independently of the shaft, the straight belt 91 passing around the central or tight pulley 95 and the crossed belt 92 passing around the loose pulley 96 when the parts occupy the positions as illustrated in Fig. 3 of the drawings. On the shaft 93 is also mounted the speed-pulley 97, around which passes the belt 81, the latter passing around the pulley 79. to rotate the shaft 76, as hereinbefore described.

To the frame'ofthe machine is secured a bracket 98, provided with an elongated openhereinbefore described, and by means ofwhich said lever 100 is rocked or moved. To the lower end of this lever 100 is secured by means of bolts 104E the bent arm 105, the extreme lower end of which is adapted to enorder to change the direction of travel or rotation of the shaft 93, on which said tight and loose pulleys are mounted, and consequently the direction of the shaft 76, which in turn will change the direction of travel of the spindles 64 and of the material 7 and model 6, secured to said spindles.

Presuming that the straight belt 91 passes around the tight pulley 95 andthe crossed belt 92 around the loose pulley 96, as illustrated in Fig. 3 of the drawings, the disk 84 will travel from right to left until the trippingarm 88 strikes the lug or projection 103 on the upper end of the lever 100, whereupon the upper endof said lever will be moved toward the right, and consequently the lower end toward the left, this shifting of the lever 100 carrying the straight belt 91 off of the tight pulley 95 onto the loose pulley 94 and simultaneously moving the crossed .belt 92 off of the thereby changing the direction of the rotation or travel of the shaft 93 and through the medium of the belt 81, pulley 80, and shaft 76 the direction of travel of the model 6 and material 7. The disk 84, being also caused to change its direction of travel, the trippingarm 87 will strike the lug or projection 103, and thereby cause the lever 100 to be shifted into the position as illustrated in Fig. 3, this movement of the lever carrying the straight belt back onto the tight pulley 95 and the crossed belt 92 onto the loose pulley 96,th ereby again changing the direction of travel of the model 6 and material 7.

It will be understood from the foregbing that the extent of travel of the model and material in either direction is wholly governed bythe positions of the tripping-arms 87 88. The nearer they are placed together the more quickly will they trip or shift the lever 100, and consequently more quickly will they change the direction of travel of the several parts in either direction, and, vice versa, the

more widely separated they are the longerwill the several parts rotate in either direction, the adjustment of these tripping-arms being dependent upon the width of the model or pattern. In practicel have adjusted these tripping arms in such positions that the pointer or tracer will travel from one side or edge of the figured surface of the model to the opposite side or edge thereof, whereupon the direction of the model is automatically reversed, causing the pointer or tracer to travel to the opposite edge, and so on.

In order to hold the lever 100 stationary after being tripped, as before described, and thereby prevent the belts from accidentally shifting before the lever is again properly tripped, I secure to said lever the barrel or casing 106, containing a hollow plunger 107, the latter being provided on its lower end with the roller 108 and containing within the same a spring 109, the lower end of said spring IIO' bearing against said plunger and the upper end against the lower end of the adjustingscrew 110, projecting through the top of said barrel or casing 106. The roller 108 is adapted to fit in the recesses 111 112, formed in the plate 113, secured to the frame-piece 114, the latter running lengthwise of the machine. As the belt is shifted the roller 108 rides out of one recess 111 into the recess 112, the tension of the spring 109 being such as to retain the roller in one of said recesses until the lever is tripped, as hereinbefore described, and thereby hold the same in its stationary and proper position and against accidental movement or displacement.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a machine of the character described, the combination with a spindle and means for imparting motion thereto, of a pattern or die secured to one end of said spindle and means, part of which is secured to the opposite end of said spindle, whereby the direction of the movement or travel of said spindle is automatically changed,substantially as described.

-2. In a machine of the character described, the combination with a spindle carrying a pattern or die at one end thereof, of tight and loose pulleys, and belts passing around the same for imparting motion to said spindle, a lever fulcrumed to said'machine, and tripping mechanism carried by the opposite end of said spindle, and engaging with said lever, whereby said belts are alternately shifted to the tight and loose pulleys for changing the direction of travel of said spindle, substantially as described.

3. In a machine of the character described, the combination with a spindle having a pattern or die secured at one end thereof, of tight and loose pulleys having straight and crossed belts passing around the same for imparting motion to said spindle, a lever fnlcrumed to said machine, and engaging with said belts, tripping mechanism carried by said spindle and adapted to engage with said lever, whereby said belts are alternately shifted from the tight to the loose pulleys for changing the direction of said spindle, and means for holding said lever stationary in its different positions, substantially as described.

1. In a machine of the character described, the combination with a spindle carrying a die or pattern at one end, of tight and loose pulleys having straight and crossed belts passing around the same for imparting motion to said spindle, a lever fulcrumed to said machine and engaging at its lower end with said belts, a disk carried by the opposite end of said spindle and having adjustable tripping-arms secured thereto and engaging with the upper end of said lever, whereby said lever will alternately shift the straight and crossed belts from the tight to the loose pulleys and change the direction of travel of said spindle, substantially as described.

5. In a machine of the character described, the combination with a spindle, of apattern or die secured to one end thereof, a disk secured to the opposite end of said spindle and provided with adjustable tripping-arms, tight and loose pulleys arranged upon shafts carried by said machine, straight and crossed belts passing around said pulleys for imparting motion to said spindle, a lever fulcrumed to said machine, and having its lower end engaging With said belts and its upper end with said tripping-arms, whereby said belts are alternately shifted from the tight to the loose pulleys, and the direction of travel of said spindle thereby changed, a plate secured to the frame of said machine and provided with recesses, and a spring-actuated plunger se cured to said lever and adapted to fit in said recesses and hold the lever stationary until moved by said tripping mechanism, substantially as described.

Signed at New York, in the county of New York and State of New York, this 6th day of August, A. D. 1901.

JOSEPH FINK KELLER.

\Nitnesses:

GEORGE 000K, M. VAN NORTWICK. 

